Custom warning message does not show when called within a function

21 次查看（过去 30 天）
Pascal Weller
Pascal Weller 2020-11-4
评论： Mario Malic 2020-11-4
Hello,
I have got difficulties to get custom warning messages to pop up in MATLAB's console.
Scenario:
I start execution of the main script. At some point it calls a function that is coded in a seperate .m file. From this called function I would like to display a warning. It executes the line where the warning is called but nothing shows up in the console. How do I make this warning to show up? Thanks in advance for your help!
Dummy code:
Main script which is run:
clear;
fd = 'test.h5'
...
foo(fd);
...
Script for function foo():
function foo(fd)
if exist(fd,'file')
warning('''%s'' already exists. Overwriting it.',fd);
...
end
...
end
Btw: When I put a fprintf() or disp() or error() instead of the warning() it will show up in the console.
  3 个评论
显示 1更早的评论
Pascal Weller
Pascal Weller 2020-11-4
Thanks for the quick response. Your prediction was accurate.
>> warning;
All warnings have the state 'off'.
For anyone facing the same issue: Here is how to enable all warnings:
warning('on');

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Luna
Luna 2020-11-4
编辑：Luna 2020-11-4
I agree with Walter, put that code on command window to get all warnings on:
warning all on;
Be sure that your if statement result is true. I recommend you to try this first:
function foo(fd)
if exist(fd,'file') == 2 % this is about exist function outputs. Check all the output states. if it is 2, that means file exists.
warning('''%s'' already exists. Overwriting it.',fd);
else
warning([fd, ' file does not exist.']);
end
end
Here is the link for exist function documentation:
exist
  1 个评论
Mario Malic
Mario Malic 2020-11-4
It looks like that if expression is true when expression result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by